CN105789906A - 2D phase gradient super-surface composite structure - Google Patents
2D phase gradient super-surface composite structure Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0026—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices having a stacked geometry or having multiple layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0046—Theoretical analysis and design methods of such selective devices
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Abstract
The invention discloses a 2D phase gradient super-surface composite structure, and belongs to the field of electromagnetic scattering control of a microwave technology. The structure comprises a metal bottom plate, an intermediate medium layer and a metal patch layer, wherein the intermediate medium layer is located on the metal bottom plate; the metal patch layer in periodic distribution is located on the medium layer; the metal patch layer comprises periodic units arranged in an array; the belonging periodic units are in a 2*2 mesh structure; the 2D phase gradient super-surface composite structure is characterized in that metal patches are distributed in each mesh in the array; the dimensions of the metal patches in each mesh are gradually changed along the transverse direction or the longitudinal direction of the array; and the gradual change directions of the dimensions of the metal patches in the adjacent meshes in each periodic unit are opposite. According to the 2D phase gradient super-surface composite structure, the specular scattering field energy is reset into other directions by an offset of a main lobe peak, or even an incident plane wave can be directly converted into a surface wave for transmission in the super-structure surface; the electromagnetic wave direction can be relatively intelligently controlled, so that specular scattering and edge scattering are relatively well controlled; and the construction technology is simple, reliable and easy to implement.
Description
Technical field
The invention belongs to microwave technology electromagnetic scattering control field, relate to a kind of can the super surface recombination structure of 2D phase gradient in Based Intelligent Control electromagnetic wave propagation direction and construction method thereof in special frequency band.
Background technology
Stealth technology is an up weaponry penetration ability and the technology of survival ability most critical, along with the development of the radar exploration technique, controls objective body radar scattering feature, promotes novel stealth technology Deep Development particularly important.RCS (RCS) is as the important physical amount weighing objective body Stealth Fighter quality, and the detecting devices determining enemy can detect and follow the tracks of the distance size of our target.In other words, namely RCS is more little, illustrates that the Stealth Fighter of objective body is more good, is more difficult to be detected by enemy radar receiver；Otherwise, RCS is more big, then objective body Stealth Fighter is more poor.Common radar stealth technology includes shaping technique, radar absorbing (RAM), active offseting offset with passive.
Along with the fast development of stealth technology, material and the method for objective body RCS can be reduced in the urgent need to development.Inhale wave method such as SalisburyScreen, Dallenbachabsorber, CircuitAnalogabsorbers, Frequencyselectivesurfaces (FSS), Jaumannabsorbers, and Gradedabsorbers etc.；Development recently as Meta Materials or super sufacing, occur in that namely another RCS important method reduced resets scattered field energy [1-2], if M.Paquay and J.C.Iriarte is in the traditional gridiron pattern structure being combined into by PEC and AMC of design in 2007, the scattered field energy being directed to interferes cancellation principle to be exactly a kind of effective means reset or disperse scattered field energy.Additionally, super surface can realize the amplitude to echo or transmitted wave and the adjustment of phase place because of the metal array structure of the sub-wavelength thickness of its uniqueness, in electromagnetic wave propagation control, polarization of ele modulation etc., there is important application prospect；The super surface of phase gradient therein (PGMs) is a kind of by the super surface of anisotropy having out of phase but have a series of different sizes of the given reference phase difference regularity of distribution or difform construction unit direction in face to be formed, the direction of propagation of echo or transmission wave beam can be more freely controlled by the structure of its deep sub-wavelength thickness, it is made no longer to follow traditional reflection/transmission law (Snell ' sLaw, Fresnelequations).Such as: the Zhou Lei professor of Fudan University and the H-shaped structure of Research team design thereof achieve the super surface of reflection type phase gradient that incident electromagnetic wave can be converted into surface wave；The v-shaped structure in south et al. design of Harvard University successfully constructs the super surface of phase gradient that can realize anomalous refraction in optical band.
Summary of the invention
It is an object of the present invention to provide a kind of super surface recombination structure of novel 2D phase gradient, similar the super surface texture unit of AMC unit phase gradient in traditional gridiron pattern structure is replaced, realize the redistribution of scattered field energy, electromagnetic scattering main lobe energy is removed back scattering direction, thus realizing effectively reducing objective body mono-static RCS.
The technical scheme is that the super surface recombination structure of a kind of 2D phase gradient, this structure includes: metal base plate, the middle dielectric layer being positioned on metal base plate, the metal patch layer that is positioned on dielectric layer period profile；Said metal patch layer includes the periodic unit of array distribution；Affiliated periodic unit is the network of 2 × 2, it is characterized in that in each grid, array distribution has metal patch, metal patch size in each grid is along the laterally or longitudinally gradual change of array, and in affiliated periodic unit, the metal patch size gradation in adjacent mesh is in opposite direction.
Further, in described periodic unit, the metal patch decreasing dimensions method in adjacent mesh is:
Step 1: surface metal patch size is the same from situation, obtains the super surface texture with different size metal patch to the phase place of reflection of electromagnetic wave and frequency dependence in the frequency range of regulation；
Step 2: choose specific mid frequency according to practical situation, obtain result according to step 1, extracts phase place and metal patch size relationship curve under this mid frequency；
Step 3: according to practical situation selected phase scope and phase gradient, it is thus achieved that a series of phase points with gradient；
Step 4: according to the corresponding metal patch size of each phase point of the result of step 2, obtain the metal patch size of a series of gradual change.
Further, described metal patch is square metal paster.
Further, the FR4 baseplate material of the dielectric layer material of described super surface recombination structure is dielectric constant to be ε=4.3, loss tangent angle be tan δ=0.025, thickness d=1.6mm；Coating metal patch size is respectively as follows: the size gradation system of 5.02mm, 7.47mm, 7.94mm, 8.37mm, 9.42mm or the size gradation system of 7mm, 7.86mm, 8.26mm, 8.64mm, 9.23mm.
The present invention novel 2D phase gradient super surface recombination structure design principle is in that: adopt the gradual period unit of the similar gridiron pattern distribution of the consistent 2D of picture on surface arrangement mode of diagonal arrangement to constitute, wherein 1/4 block period cellular construction adopts the metal square patch of the array arrangement of size gradation to be arranged in a combination according to specific phase gradient Changing Pattern, this kind of structure utilizes various sizes of metal patch to have different reflected phase, makes whole super surface constitute the super surface of linear reflective phase place heterogeneous.Suitably sized gradual change system can be chosen according to the different gradient factors, when plane wave impinges perpendicularly on this super surface texture surface patterned layer, owing to pattern dimension difference causes the existence of reflection electromagnetic wave phase gradient, make echo deviation incident electromagnetic wave direction, the skew at main lobe peak reset mirror to scattered field energy to other direction, incident plane wave even can be converted into surface wave transmit in superstructure face, control electromagnetic wave direction that can be more intelligent, so that mirror is better controlled to scattering and edge scatter, and construction technology is simple and reliable, easily realize.The present invention realizes the simulation result under VV polarized wave incidence: mirror reduces about 17.5dB, whole angular domain RCS to RCS and reduces average and be about 15dB；Simulation result under HH polarized wave incidence: mirror subtracts about 12.5dB, whole angular domain RCS to RCS and reduces average and be about 10dB.
Accompanying drawing explanation
In Fig. 1 present invention, the periodic unit body structure surface of 110mm × 110mm × 1.6mm that phase gradient super surface is constituted when being formed 4 " 5 × 5 " array elements in reversely arrangement by size gradation system 1 simplifies structural representation；
The structure cell schematic diagram of the super surface texture of phase gradient in Fig. 2 present invention；
The super surface texture of phase gradient when 4 " 5 × 5 " array elements of size gradation system 1 correspondence are in reversely arrangement in Fig. 3 present invention, the RCS characteristic Simulation result when electromagnetic wave incident；
The super surface texture of phase gradient when 4 " 5 × 5 " array elements of size gradation system 1 correspondence are in reversely arrangement in Fig. 4 present invention, the RCS characteristic test result when electromagnetic wave incident；
In Fig. 5 present invention, the periodic unit body structure surface of 110mm × 110mm × 1.6mm that phase gradient super surface is constituted when being formed 4 " 5 × 5 " array elements in reversely arrangement by size gradation system 2 simplifies structural representation；
The super surface texture of phase gradient when 4 " 5 × 5 " array elements of size gradation system 2 correspondence are in reversely arrangement in Fig. 6 present invention, the RCS characteristic Simulation result when electromagnetic wave incident；
Accompanying drawing labelling: P is cellular cycle 11mm, d be thickness of dielectric layers 1.6mm, a is the metal squares pattern length of side.
Detailed description of the invention
The aforementioned super surface recombination structure of novel 2D phase gradient is adopted to be embodied as, specific as follows:
The super surface recombination structure of the present invention novel 2D phase gradient, the construction method of its design of Simulation is divided into following four steps: one, modeling in CST, simulation optimization must in the size system (phase place & size) of the super surface texture unit that mid frequency 7GHz, phase range are ± 150 °；Two, selected phase contrast isCorresponding size system 1 HeCorresponding size system 2 (concrete size value corresponding respectively is as previously mentioned), the cellular cycle is P=11mm, obtains the phase taper factorThe size system obtained according to the linear gradient of fade factor g in FEKO, models the super surface recombination structure of 2D phase gradient of rectangle combination type, the arrangement of similar gridiron pattern pattern；Three: in FEKO, carry out the scattering signatures of 220mm × 220mm × 1.6mm structure that simulation calculation is combined by four periodic structures, and carry out corresponding data process.
Embodiment 1:
A kind of super surface recombination structure of novel 2D phase gradient in the reversely periodic structure unit of the 110mm × 110mm × 1.6mm of arrangement built by 4 " 5 × 5 " array elements of size gradation system 1 correspondence, its pattern unit structure is as shown in Figure 1, wherein structure cell is as shown in Figure 2, simulation result is as shown in Figure 3, as shown in Figure 4, concrete dimensional parameters is (unit mm) to experimental result:
P=11mm, d=1.6mm, ε=4.3, tan δ=0.025, metal pattern layer is size gradation system 1:a=5.02mm, 7.47mm, 7.94mm, 8.37mm, 9.42mm；
Design the super surface recombination structure of novel 2D phase gradient obtained by the way, realize simulation result when VV polarized wave is incident: mirror reduces about 17.5dB, whole angular domain RCS to RCS, and to reduce average be 15dB；Realize simulation result when HH polarized wave is incident: mirror reduces to RCS and is about 12.5dB, and traveling wave suppresses to be about 13dB, whole angular domain RCS and reduces average and be about 10dB；Having the RCS average more than 10dB to reduce within the scope of wide angular domain, bandwidth 1GHz, two kinds of polarization are effectively；Experimental results is: it is that 10dB reduces that the lower RCS of VV polarization reduces average；It is 7.5dB that the lower RCS of HH polarization reduces average, substantially identical with simulation result.
Embodiment 2:
A kind of super surface texture of phase gradient in the reversely periodic structure unit of the 110mm × 110mm × 1.6mm of arrangement built by 4 " 5 × 5 " array elements of size gradation system 2 correspondence, its pattern unit structure is as shown in Figure 5, wherein structure cell is as shown in Figure 2, as shown in Figure 6, concrete dimensional parameters is (unit mm) to simulation result:
P=11mm, d=1.6mm, ε=4.3, tan δ=0.025, metal pattern layer is size gradation system 2:a=7mm, 7.86mm, 8.26mm, 8.64mm, 9.23mm；
Design the super surface recombination structure of novel 2D phase gradient obtained by the way, realize simulation result when VV polarized wave is incident: mirror reduces about 17.7dB, whole angular domain RCS to RCS, and to reduce average be 7dB；Realize simulation result when HH polarized wave is incident: mirror reduces to RCS and is about 16.4dB, and traveling wave suppresses to be about 12dB, whole angular domain RCS and reduces average and be about 9.7dB；Having the RCS average more than 7dB to reduce within the scope of wide angular domain, bandwidth 1GHz, two kinds of polarization are effectively.
Embodiment 3:
A kind of super surface texture of phase gradient in the periodic structure unit of the 110mm × 110mm × 1.6mm of arrangement clockwise built by 4 " 5 × 5 " array elements of size gradation system 2 correspondence, wherein structure cell is as in figure 2 it is shown, concrete dimensional parameters is (unit mm):
P=11mm, d=1.6mm, ε=4.3, tan δ=0.025, metal pattern layer is size gradation system 2:a=7mm, 7.86mm, 8.26mm, 8.64mm, 9.23mm；
Design the super surface recombination structure of novel 2D phase gradient obtained by the way, realize simulation result when VV polarized wave is incident: mirror reduces about 17.6dB, whole angular domain RCS to RCS, and to reduce average be 8dB；Realize simulation result when HH polarized wave is incident: mirror reduces to RCS and is about 18.6dB, and traveling wave suppresses to be about 12dB, whole angular domain RCS and reduces average and be about 8.5dB；Having the RCS average more than 8dB to reduce within the scope of wide angular domain, bandwidth 1GHz, two kinds of polarization are effectively；
Embodiment 4:
A kind of phase gradient super surface texture of the periodic structure unit of the 110mm × 110mm × 1.6mm of the orthogonal thereto arrangement built by 4 " 5 × 5 " array elements of size gradation system 2 correspondence, wherein structure cell is as in figure 2 it is shown, concrete dimensional parameters is (unit mm):
P=11mm, d=1.6mm, ε=4.3, tan δ=0.025, metal pattern layer is size gradation system 2:a=7mm, 7.86mm, 8.26mm, 8.64mm, 9.23mm；
Design the super surface recombination structure of novel 2D phase gradient obtained by the way, realize simulation result when VV polarized wave is incident: mirror reduces about 17.7dB, whole angular domain RCS to RCS, and to reduce average be 9dB；Realize simulation result when HH polarized wave is incident: mirror reduces to RCS and is about 18.5dB, and traveling wave suppresses to be about 14dB, whole angular domain RCS and reduces average and be about 12.5dB；Having the RCS average more than 9dB to reduce within the scope of wide angular domain, bandwidth 1GHz, two kinds of polarization are effectively.
Claims (4)
1. a super surface recombination structure for 2D phase gradient, this structure includes: metal base plate, the middle dielectric layer being positioned on metal base plate, the metal patch layer that is positioned on dielectric layer period profile；Said metal patch layer includes the periodic unit of array distribution；Affiliated periodic unit is the network of 2 × 2, it is characterized in that in each grid, array distribution has metal patch, metal patch size in each grid is along the laterally or longitudinally gradual change of array, and in affiliated periodic unit, the metal patch size gradation in adjacent mesh is in opposite direction.
2. the super surface recombination structure of a kind of 2D phase gradient as claimed in claim 1, it is characterised in that in described periodic unit, the metal patch decreasing dimensions method in adjacent mesh is:
Step 1: surface metal patch size is the same from situation, obtains the super surface texture with different size metal patch to the phase place of reflection of electromagnetic wave and frequency dependence in the frequency range of regulation；
Step 2: choose specific mid frequency according to practical situation, obtain result according to step 1, extracts phase place and metal patch size relationship curve under this mid frequency；
Step 3: according to practical situation selected phase scope and phase gradient, it is thus achieved that a series of phase points with gradient；
Step 4: according to the corresponding metal patch size of each phase point of the result of step 2, obtain the metal patch size of a series of gradual change.
3. the super surface recombination structure of a kind of 2D phase gradient as claimed in claim 1, it is characterised in that described metal patch is square metal paster.
4. the super surface recombination structure of a kind of 2D phase gradient as claimed in claim 2, it is characterized in that the dielectric layer material of described super surface recombination structure to be dielectric constant be the FR4 baseplate material that ε=4.3, loss tangent angle are tan δ=0.025, thickness d=1.6mm；Coating metal patch size is respectively as follows: the size gradation system of 5.02mm, 7.47mm, 7.94mm, 8.37mm, 9.42mm or the size gradation system of 7mm, 7.86mm, 8.26mm, 8.64mm, 9.23mm.
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| CN107039771A (en) * | 2016-09-19 | 2017-08-11 | 北京邮电大学 | A kind of super surface cell of phase gradient, hyperelement and reflective array |
| CN107453050A (en) * | 2017-06-20 | 2017-12-08 | 南京航空航天大学 | Surpass the broadband lens on surface based on phase gradient |
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| CN113471713A (en) * | 2021-08-13 | 2021-10-01 | 电子科技大学长三角研究院(湖州) | Angular domain filter based on super surface structure |
| CN113991304B (en) * | 2021-09-15 | 2023-08-22 | 北京邮电大学 | Antenna beam forming method based on super-surface array |
| CN113991304A (en) * | 2021-09-15 | 2022-01-28 | 北京邮电大学 | Antenna beam forming method based on super-surface array |
| CN114442206A (en) * | 2022-01-15 | 2022-05-06 | 复旦大学 | Near-field surface wave high-efficiency far-field directional radiation coupler based on super surface |
| CN114442206B (en) * | 2022-01-15 | 2023-09-01 | 复旦大学 | Near-field surface wave high-efficiency far-field directional radiation coupler based on super surface |
| CN115036703A (en) * | 2022-06-14 | 2022-09-09 | 电子科技大学 | RCS reduction dihedral angle structure based on phase cancellation and design method thereof |
| CN115036703B (en) * | 2022-06-14 | 2023-08-25 | 电子科技大学 | RCS shrinkage dihedral angle structure based on phase cancellation and design method thereof |
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